<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>多个背景</title>
    <style>
        html{
            height: 100%;
            background-color: #cccccc;
            margin:0;
        }
        .duo{
            width: 623px;
            height: 417px;
            margin:100px auto;
            background: url("images/bg1.png") left top,url(images/bg2.png) right top,url(images/bg3.png) right bottom,url(images/bg4.png) left bottom,url(images/bg5.png) center center;
            background-repeat: no-repeat;
            background-color: transparent;
        }
    </style>
</head>
<body>
    <div class="duo"></div>
</body>
</html>